import React, { useState, useEffect } from 'react';
import { ArrowLeft, BarChart3, Users, TrendingUp, MessageSquare, Calendar, Building2, Eye, Key, Copy, CheckCircle2, X } from 'lucide-react';
import { apiClient } from '../../services/apiClient';
import { NPSSurvey, NPSSurveyStats, NPSResponse } from '../../types';

interface NPSSurveyStatsPageProps {
  surveyId: string | number;
  onBack?: () => void;
}

export const NPSSurveyStatsPage: React.FC<NPSSurveyStatsPageProps> = ({ surveyId, onBack }) => {
  const [survey, setSurvey] = useState<NPSSurvey | null>(null);
  const [stats, setStats] = useState<NPSSurveyStats | null>(null);
  const [responses, setResponses] = useState<NPSResponse[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [showAccessKeyModal, setShowAccessKeyModal] = useState(false);
  const [copied, setCopied] = useState(false);
  const [selectedMonth, setSelectedMonth] = useState<{ month: number; year: number }>(() => {
    const now = new Date();
    return { month: now.getMonth() + 1, year: now.getFullYear() };
  });

  useEffect(() => {
    loadData();
  }, [surveyId, selectedMonth]);

  const loadData = async () => {
    try {
      setIsLoading(true);
      const params = new URLSearchParams();
      params.append('month', selectedMonth.month.toString());
      params.append('year', selectedMonth.year.toString());
      
      const [surveyData, statsData, responsesData] = await Promise.all([
        apiClient.get<NPSSurvey>(`/pr/nps-surveys/${surveyId}`),
        apiClient.get<NPSSurveyStats>(`/pr/nps-surveys/${surveyId}/stats?${params.toString()}`),
        apiClient.get<NPSResponse[]>(`/pr/nps-surveys/${surveyId}/responses?${params.toString()}`)
      ]);
      setSurvey(surveyData);
      setStats(statsData);
      setResponses(responsesData);
    } catch (err) {
      console.error('Error loading survey data:', err);
      setSurvey(null);
      setStats(null);
      setResponses([]);
    } finally {
      setIsLoading(false);
    }
  };

  const getSurveyLink = () => {
    if (!survey) return '';
    return `${window.location.origin}/nps/${survey.id}?key=${survey.accessKey}`;
  };

  const handleCopyLink = () => {
    const link = getSurveyLink();
    navigator.clipboard.writeText(link);
    setCopied(true);
    setTimeout(() => setCopied(false), 2000);
  };

  const getNPSColor = (nps: number) => {
    if (nps >= 50) return 'text-emerald-600';
    if (nps >= 0) return 'text-amber-600';
    return 'text-red-600';
  };

  const getScoreColor = (score: number) => {
    if (score >= 9) return 'bg-emerald-100 text-emerald-700 border-emerald-200';
    if (score >= 7) return 'bg-amber-100 text-amber-700 border-amber-200';
    return 'bg-red-100 text-red-700 border-red-200';
  };

  if (isLoading) {
    return (
      <div className="min-h-screen flex items-center justify-center">
        <div className="text-center">
          <div className="w-16 h-16 border-4 border-primary-600 border-t-transparent rounded-full animate-spin mx-auto mb-4"></div>
          <p className="text-slate-600">Загрузка статистики...</p>
        </div>
      </div>
    );
  }

  if (!survey) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-slate-50">
        <div className="text-center text-slate-600">
          <p className="font-bold mb-2">Не удалось загрузить данные опроса NPS</p>
          {onBack && (
            <button
              onClick={onBack}
              className="mt-2 px-4 py-2 bg-primary-600 text-white rounded-xl text-sm font-bold"
            >
              Вернуться к списку опросов
            </button>
          )}
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-gradient-to-br from-slate-50 via-white to-slate-50">
      {/* Header */}
      {onBack && (
        <div className="sticky top-0 z-50 bg-white/80 backdrop-blur-md border-b border-slate-200">
          <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-4">
            <div className="flex items-center justify-between">
              <button
                onClick={onBack}
                className="flex items-center gap-2 text-slate-600 hover:text-slate-900 transition-colors group"
              >
                <ArrowLeft className="w-5 h-5 group-hover:-translate-x-1 transition-transform" />
                <span className="text-sm font-bold">Вернуться к списку опросов</span>
              </button>
              
              <div className="flex items-center gap-3">
                <button
                  onClick={() => setShowAccessKeyModal(true)}
                  className="px-4 py-2 bg-indigo-600 hover:bg-indigo-700 text-white rounded-xl text-sm font-bold flex items-center gap-2 transition-colors"
                >
                  <Key className="w-4 h-4" />
                  Получить ссылку
                </button>
              </div>
            </div>
          </div>
        </div>
      )}

      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
        {/* Заголовок */}
        <div className="mb-8">
          <div className="flex items-center justify-between mb-4">
            <div className="flex items-center gap-4">
              <div className="p-4 bg-gradient-to-br from-indigo-600 to-purple-600 rounded-3xl text-white shadow-xl">
                <BarChart3 className="w-8 h-8" />
              </div>
              <div>
                <h1 className="text-3xl font-black text-slate-800">{survey.title}</h1>
                {survey.address && (
                  <p className="text-sm text-slate-600 flex items-center gap-1 mt-1">
                    <Building2 className="w-4 h-4" />
                    {survey.address}
                  </p>
                )}
              </div>
            </div>
            {/* Выбор месяца */}
            <div className="flex gap-2 items-center">
              <select
                value={selectedMonth.month}
                onChange={(e) => setSelectedMonth({ ...selectedMonth, month: parseInt(e.target.value) })}
                className="px-4 py-2 bg-white border border-slate-200 rounded-xl text-sm font-bold focus:outline-none focus:ring-2 focus:ring-indigo-500"
              >
                {[1,2,3,4,5,6,7,8,9,10,11,12].map(m => (
                  <option key={m} value={m}>
                    {new Date(2000, m - 1).toLocaleDateString('ru-RU', { month: 'long' })}
                  </option>
                ))}
              </select>
              <select
                value={selectedMonth.year}
                onChange={(e) => setSelectedMonth({ ...selectedMonth, year: parseInt(e.target.value) })}
                className="px-4 py-2 bg-white border border-slate-200 rounded-xl text-sm font-bold focus:outline-none focus:ring-2 focus:ring-indigo-500"
              >
                {Array.from({ length: 5 }, (_, i) => new Date().getFullYear() - 2 + i).map(y => (
                  <option key={y} value={y}>{y}</option>
                ))}
              </select>
            </div>
          </div>
        </div>

        {/* Основная статистика */}
        {stats && (
          <div className="grid grid-cols-1 lg:grid-cols-3 gap-6 mb-8">
            {/* NPS Score */}
            <div className="lg:col-span-2 bg-white rounded-2xl p-6 shadow-lg border border-slate-200">
              <h3 className="text-lg font-black text-slate-800 mb-6">Индекс NPS</h3>
              <div className="text-center">
                <div className={`inline-flex items-center justify-center w-40 h-40 rounded-full bg-gradient-to-br from-indigo-500 to-purple-600 text-white mb-6 shadow-xl ${getNPSColor(stats.nps)}`}>
                  <div className="text-center">
                    <div className="text-6xl font-black">{stats.nps > 0 ? '+' : ''}{stats.nps}</div>
                    <div className="text-sm font-bold opacity-90">NPS</div>
                  </div>
                </div>
                <p className="text-lg font-bold text-slate-800 mb-2">
                  {stats.nps >= 50 ? 'Отличный показатель' 
                    : stats.nps >= 0 ? 'Хороший показатель' 
                    : 'Требует внимания'}
                </p>
                <p className="text-sm text-slate-600">
                  Средняя оценка:{' '}
                  <span className="font-black">
                    {(stats.avgScore ?? 0).toFixed(1)}
                  </span>{' '}
                  из 10
                </p>
              </div>
            </div>

            {/* Общая статистика */}
            <div className="bg-white rounded-2xl p-6 shadow-lg border border-slate-200">
              <h3 className="text-lg font-black text-slate-800 mb-6">Общая статистика</h3>
              <div className="space-y-4">
                <div>
                  <p className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-1">Всего ответов</p>
                  <p className="text-3xl font-black text-slate-800">{stats.totalResponses ?? 0}</p>
                </div>
                <div className="pt-4 border-t border-slate-200">
                  <p className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-3">Распределение</p>
                  <div className="space-y-3">
                    <div>
                      <div className="flex justify-between items-center mb-2">
                        <span className="text-sm font-bold text-emerald-700">Промоутеры</span>
                        <span className="text-sm font-black text-slate-800">
                          {stats.promoters ?? 0} ({(stats.promoterPercent ?? 0).toFixed(1)}%)
                        </span>
                      </div>
                      <div className="w-full bg-slate-200 rounded-full h-3 overflow-hidden">
                        <div className="h-full bg-emerald-500 rounded-full transition-all duration-500" style={{ width: `${stats.promoterPercent}%` }}></div>
                      </div>
                    </div>
                    <div>
                      <div className="flex justify-between items-center mb-2">
                        <span className="text-sm font-bold text-amber-700">Нейтральные</span>
                        <span className="text-sm font-black text-slate-800">
                          {stats.passives ?? 0} (
                            {stats.totalResponses
                              ? ((stats.passives / stats.totalResponses) * 100).toFixed(1)
                              : '0.0'
                            }%)
                        </span>
                      </div>
                      <div className="w-full bg-slate-200 rounded-full h-3 overflow-hidden">
                        <div
                          className="h-full bg-amber-500 rounded-full transition-all duration-500"
                          style={{
                            width: `${stats.totalResponses ? (stats.passives / stats.totalResponses) * 100 : 0}%`
                          }}
                        ></div>
                      </div>
                    </div>
                    <div>
                      <div className="flex justify-between items-center mb-2">
                        <span className="text-sm font-bold text-red-700">Критики</span>
                        <span className="text-sm font-black text-slate-800">
                          {stats.detractors ?? 0} ({(stats.detractorPercent ?? 0).toFixed(1)}%)
                        </span>
                      </div>
                      <div className="w-full bg-slate-200 rounded-full h-3 overflow-hidden">
                        <div className="h-full bg-red-500 rounded-full transition-all duration-500" style={{ width: `${stats.detractorPercent}%` }}></div>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        )}

        {/* Список ответов */}
          <div className="bg-white rounded-2xl p-6 shadow-lg border border-slate-200">
            <div className="flex items-center justify-between mb-6">
              <h3 className="text-lg font-black text-slate-800">
                Ответы жителей за {new Date(selectedMonth.year, selectedMonth.month - 1).toLocaleDateString('ru-RU', { month: 'long', year: 'numeric' })}
              </h3>
              <span className="text-sm text-slate-500">Всего: {responses.length}</span>
            </div>

          {responses.length === 0 ? (
            <div className="text-center py-12">
              <MessageSquare className="w-12 h-12 text-slate-300 mx-auto mb-4" />
              <p className="text-slate-600">Пока нет ответов</p>
            </div>
          ) : (
            <div className="space-y-4">
              {responses.map(response => (
                <div
                  key={response.id}
                  className="p-4 bg-slate-50 rounded-xl border border-slate-200 hover:shadow-md transition-shadow"
                >
                  <div className="flex items-start justify-between gap-4">
                    <div className="flex-1">
                      <div className="flex items-center gap-3 mb-2">
                        <div className={`px-3 py-1 rounded-lg border-2 font-black text-lg ${getScoreColor(response.score)}`}>
                          {response.score}
                        </div>
                        <div>
                          {response.respondentName && (
                            <p className="font-bold text-slate-800">{response.respondentName}</p>
                          )}
                          {response.apartment && (
                            <p className="text-xs text-slate-500">Квартира №{response.apartment}</p>
                          )}
                        </div>
                      </div>
                      {response.comment && (
                        <p className="text-sm text-slate-700 mt-2 pl-12">{response.comment}</p>
                      )}
                    </div>
                    <div className="text-right">
                      <p className="text-xs text-slate-500">
                        {new Date(response.createdAt).toLocaleDateString('ru-RU', {
                          day: 'numeric',
                          month: 'short',
                          year: 'numeric',
                          hour: '2-digit',
                          minute: '2-digit'
                        })}
                      </p>
                    </div>
                  </div>
                </div>
              ))}
            </div>
          )}
        </div>
      </div>

      {/* Модальное окно с ключом доступа */}
      {showAccessKeyModal && survey && (
        <div className="fixed inset-0 bg-black/50 flex items-center justify-center z-50 p-4">
          <div className="bg-white rounded-3xl p-8 max-w-lg w-full shadow-2xl">
            <div className="flex justify-between items-center mb-6">
              <div className="flex items-center gap-3">
                <div className="p-2 bg-indigo-100 rounded-xl">
                  <Key className="w-6 h-6 text-indigo-600" />
                </div>
                <h3 className="text-xl font-black text-slate-800">Ссылка на опрос</h3>
              </div>
              <button 
                onClick={() => setShowAccessKeyModal(false)}
                className="p-2 hover:bg-slate-100 rounded-xl transition-colors"
              >
                <X className="w-5 h-5 text-slate-400" />
              </button>
            </div>

            <div className="space-y-4">
              <div>
                <label className="block text-xs font-black text-slate-600 uppercase tracking-wider mb-2">
                  Ключ доступа
                </label>
                <div className="flex gap-2">
                  <input
                    type="text"
                    value={survey.accessKey}
                    readOnly
                    className="flex-1 px-4 py-3 bg-slate-50 border border-slate-200 rounded-xl text-sm font-mono"
                  />
                  <button
                    onClick={() => {
                      navigator.clipboard.writeText(survey.accessKey);
                      alert('Ключ скопирован');
                    }}
                    className="px-4 py-3 bg-slate-100 hover:bg-slate-200 text-slate-700 rounded-xl text-sm font-bold transition-colors"
                  >
                    <Copy className="w-4 h-4" />
                  </button>
                </div>
              </div>
              <div>
                <label className="block text-xs font-black text-slate-600 uppercase tracking-wider mb-2">
                  Ссылка на опрос
                </label>
                <div className="flex gap-2">
                  <input
                    type="text"
                    value={getSurveyLink()}
                    readOnly
                    className="flex-1 px-4 py-3 bg-slate-50 border border-slate-200 rounded-xl text-sm"
                  />
                  <button
                    onClick={handleCopyLink}
                    className="px-4 py-3 bg-indigo-600 hover:bg-indigo-700 text-white rounded-xl text-sm font-bold transition-colors"
                  >
                    {copied ? <CheckCircle2 className="w-4 h-4" /> : <Copy className="w-4 h-4" />}
                  </button>
                </div>
              </div>
              <div className="mt-6 p-4 bg-amber-50 rounded-xl border border-amber-200">
                <p className="text-xs text-amber-800">
                  <strong className="font-black">Важно:</strong> Ссылка содержит ключ доступа. Отправляйте её только жителям выбранного дома.
                </p>
              </div>
            </div>
            <button
              onClick={() => setShowAccessKeyModal(false)}
              className="w-full mt-6 px-4 py-3 bg-indigo-600 hover:bg-indigo-700 text-white rounded-xl text-sm font-bold transition-colors"
            >
              Закрыть
            </button>
          </div>
        </div>
      )}
    </div>
  );
};